Windows re-install, Now VR games start lagging horribly after about 5 minutes of playing

Have been using my Rift for about a month now and has been working fine running buttery smooth on my GTX 1060 and i5 6500 @ 4.3ghz But the other day i did a fresh install of windows and installed all the drivers and the oculus software.My game runs perfectly fine for a couple minutes and then from nowhere i get super bad lagging around 10 fps for no apparent reason.